Knowledge of something; being aware of something
Awareness
When you are jealous of someone
Envy
Refusing to change opinion or attitude
Stubborn
When something is powered by the sun
Solar-powered
Very, very, very old
Ancient
To eat something quickly and messily
Gobble
Dirt, gross stuff; someone awful
Scum
A serious problem that needs immediate attention
Emergency
Someone who betrays a friend
Traitor
Able to hurt or harm
Harmful